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Debt (Details)
1 Months Ended 3 Months Ended 9 Months Ended
Apr. 14, 2015
USD ($)
Oct. 21, 2015
Sep. 30, 2012
Sep. 30, 2015
USD ($)
Sep. 30, 2015
USD ($)
Nov. 04, 2015
USD ($)
Oct. 16, 2015
USD ($)
Apr. 06, 2015
USD ($)
Feb. 27, 2015
USD ($)
Dec. 31, 2014
USD ($)
Sep. 28, 2012
USD ($)
Sep. 27, 2012
USD ($)
Revolving Credit Agreement (Textual) [Abstract]                        
Senior unsecured notes       $ 390,959,000 $ 390,959,000         $ 0    
Borrowings under Credit Agreement       0 0         $ 338,199,000    
Borrowed under credit agreement       $ 0 $ 0              
HEYCO                        
Revolving Credit Agreement (Textual) [Abstract]                        
Notes payable assumed in business combination                 $ 11,982,000      
Third Amended Credit Agreement                        
Revolving Credit Agreement (Textual) [Abstract]                        
Company amended and restated its senior secured revolving credit agreement     September 28, 2012                  
Senior secured revolving credit maximum facility                     $ 500,000,000 $ 400,000,000
Credit Agreement, maturity date         Dec. 29, 2016              
Percentage Of Wholly-Owned Properties Secured By Mortgages       80.00% 80.00%              
Borrowing base               $ 450,000,000        
Amount of conforming borrowing base               $ 375,000,000        
Deferred loan costs       $ 1,100,000 $ 1,100,000              
Borrowings under Credit Agreement       0 0              
Outstanding letters of credit       600,000 $ 600,000              
Repayments of outstanding borrowings       $ 465,000,000                
Percentage of reserves required to maintain         100.00%              
Debt to EBITDA Ratio         4.25              
Third Amended Credit Agreement | LIBOR rate                        
Revolving Credit Agreement (Textual) [Abstract]                        
Borrowings interest rate       1.00%                
Third Amended Credit Agreement | Minimum                        
Revolving Credit Agreement (Textual) [Abstract]                        
Commitment fee percentage       0.375%                
Third Amended Credit Agreement | Maximum                        
Revolving Credit Agreement (Textual) [Abstract]                        
Commitment fee percentage       0.50%                
Federal Funds Effective Rate | Third Amended Credit Agreement                        
Revolving Credit Agreement (Textual) [Abstract]                        
Borrowings interest rate       0.50%                
Base Rate Loan | Third Amended Credit Agreement | Minimum                        
Revolving Credit Agreement (Textual) [Abstract]                        
Additional interest rate       0.50%                
Base Rate Loan | Third Amended Credit Agreement | Maximum                        
Revolving Credit Agreement (Textual) [Abstract]                        
Additional interest rate       1.50%                
Eurodollar | Third Amended Credit Agreement | Minimum                        
Revolving Credit Agreement (Textual) [Abstract]                        
Additional interest rate       1.50%                
Eurodollar | Third Amended Credit Agreement | Maximum                        
Revolving Credit Agreement (Textual) [Abstract]                        
Additional interest rate       2.50%                
Senior Notes | Senior Notes Due 2023                        
Revolving Credit Agreement (Textual) [Abstract]                        
Senior unsecured notes $ 400,000,000                      
Borrowings interest rate 0.50%                      
Interest rate 6.875%                      
Notes maturity date Apr. 15, 2023                      
Percentage of principal amount redeemed 35.00%                      
Percentage of aggregate principal amount of Notes outstanding after redemption 65.00%                      
Percentage of principal outstanding 25.00%                      
Period when payment is due 30 days                      
Period for failure to comply with notice 180 days                      
Period after notice to comply 60 days                      
Aggregate principal amount related to payment defaults or accelerations per debt covenant terms $ 25,000,000.0                      
Aggregate failure to pay final judgments (in excess of $25 million) $ 25,000,000.0                      
Period for failure to pay final judgments 60 days                      
Senior Notes | Senior Notes Due 2023 | Time prior to April 15, 2018                        
Revolving Credit Agreement (Textual) [Abstract]                        
Percentage of principal amount redeemed 106.875%                      
Notes Payable to Banks                        
Revolving Credit Agreement (Textual) [Abstract]                        
Short-term Debt       $ 11,982,000 $ 11,982,000              
Notes Payable to Banks | HEYCO                        
Revolving Credit Agreement (Textual) [Abstract]                        
Notes payable assumed in business combination                 $ 12,500,000      
Subsequent Event | Third Amended Credit Agreement                        
Revolving Credit Agreement (Textual) [Abstract]                        
Credit Agreement, maturity date   Oct. 16, 2020                    
Amount of conforming borrowing base             $ 375,000,000          
Outstanding letters of credit           $ 600,000            
Borrowed under credit agreement           $ 0            
Subsequent Event | Senior Notes | Senior Notes Due 2023                        
Revolving Credit Agreement (Textual) [Abstract]                        
Interest rate   6.875%